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SET @save_timeout=@@GLOBAL.innodb_lock_wait_timeout;
SET GLOBAL innodb_lock_wait_timeout=100000000;
DESCRIBE INFORMATION_SCHEMA.INNODB_TRX;
Field Type Null Key Default Extra
trx_id bigint(21) unsigned NO NULL
trx_state varchar(13) NO NULL
trx_started datetime NO NULL
trx_requested_lock_id varchar(81) YES NULL
trx_wait_started datetime YES NULL
trx_weight bigint(21) unsigned NO NULL
trx_mysql_thread_id bigint(21) unsigned NO NULL
trx_query varchar(1024) YES NULL
trx_operation_state varchar(64) YES NULL
trx_tables_in_use bigint(21) unsigned NO NULL
trx_tables_locked bigint(21) unsigned NO NULL
trx_lock_structs bigint(21) unsigned NO NULL
trx_lock_memory_bytes bigint(21) unsigned NO NULL
trx_rows_locked bigint(21) unsigned NO NULL
trx_rows_modified bigint(21) unsigned NO NULL
trx_concurrency_tickets bigint(21) unsigned NO NULL
trx_isolation_level enum('READ UNCOMMITTED','READ COMMITTED','REPEATABLE READ','SERIALIZABLE') NO NULL
trx_unique_checks int(1) NO NULL
trx_foreign_key_checks int(1) NO NULL
trx_last_foreign_key_error varchar(256) YES NULL
trx_is_read_only int(1) NO NULL
trx_autocommit_non_locking int(1) NO NULL
CREATE TABLE t1 (
c01 INT,
c02 INT,
PRIMARY KEY (c01)
) ENGINE=INNODB STATS_AUTO_RECALC=0;
INSERT INTO t1 VALUES
(1,2),(2,4),(3,6),(4,8);
CREATE TABLE t2 (
c01 INT,
c02 INT,
PRIMARY KEY (c01),
FOREIGN KEY fk1 (c02) REFERENCES t1 (c01)
) ENGINE=INNODB STATS_AUTO_RECALC=0;
INSERT INTO t2 VALUES
(1,1),(2,2),(3,3);
connect con_trx,localhost,root,,;
connect con_verify_innodb_trx,localhost,root,,;
connection con_trx;
SET autocommit=0;
INSERT INTO t1 VALUES (5,10);
SELECT * FROM t1 FOR UPDATE;
c01 c02
1 2
2 4
3 6
4 8
5 10
connection con_verify_innodb_trx;
SELECT trx_state, trx_weight, trx_tables_in_use, trx_tables_locked,
trx_rows_locked, trx_rows_modified, trx_concurrency_tickets,
trx_isolation_level, trx_unique_checks, trx_foreign_key_checks
FROM INFORMATION_SCHEMA.INNODB_TRX;
trx_state trx_weight trx_tables_in_use trx_tables_locked trx_rows_locked trx_rows_modified trx_concurrency_tickets trx_isolation_level trx_unique_checks trx_foreign_key_checks
RUNNING 3 0 1 6 1 0 REPEATABLE READ 1 1
connection con_trx;
ROLLBACK;
SET FOREIGN_KEY_CHECKS = 0;
SET UNIQUE_CHECKS = 0;
SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
BEGIN;
INSERT INTO t1 VALUES (6,12);
connection con_verify_innodb_trx;
SELECT trx_isolation_level, trx_unique_checks, trx_foreign_key_checks
FROM INFORMATION_SCHEMA.INNODB_TRX;
trx_isolation_level trx_unique_checks trx_foreign_key_checks
SERIALIZABLE 0 0
connection con_trx;
ROLLBACK;
SET FOREIGN_KEY_CHECKS = 1;
SET UNIQUE_CHECKS = 1;
BEGIN;
INSERT INTO t2 VALUES (4,10);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `fk1` FOREIGN KEY (`c02`) REFERENCES `t1` (`c01`))
disconnect con_trx;
connection con_verify_innodb_trx;
SELECT trx_state, trx_isolation_level, trx_last_foreign_key_error
FROM INFORMATION_SCHEMA.INNODB_TRX;
trx_state trx_isolation_level trx_last_foreign_key_error
RUNNING REPEATABLE READ `test`.`t2`, CONSTRAINT `fk1` FOREIGN KEY (`c02`) REFERENCES `t1` (`c01`)
disconnect con_verify_innodb_trx;
connection default;
DROP TABLE t2;
DROP TABLE t1;
SET GLOBAL innodb_lock_wait_timeout=@save_timeout;
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